/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.channel;

import org.jpos.iso.*;
import org.jpos.util.LogEvent;
import org.jpos.util.Logger;

import java.io.IOException;
import java.net.ServerSocket;

/**
 * Talks with TCP based NCCs
 * Sends [LEN][TPDU][ISOMSG]
 * (len=2 bytes HEX)
 *
 * @author Mladen Mrkic <mmrkic@arius.co.yu>
 * @version $Revision: 2706 $ $Date: 2009-03-05 11:24:43 +0000 (Thu, 05 Mar 2009) $
 * @see ISOMsg
 * @see ISOException
 * @see ISOChannel
 */
public class BCDChannel extends BaseChannel {
	/**
	 * Public constructor
	 */
	public BCDChannel() {
		super();
	}

	/**
	 * Construct client ISOChannel
	 *
	 * @param host server TCP Address
	 * @param port server port number
	 * @param p    an ISOPackager
	 * @param TPDU an optional raw header (i.e. TPDU)
	 * @see ISOPackager
	 */
	public BCDChannel(String host, int port, ISOPackager p, byte[] TPDU) {
		super(host, port, p);
		this.header = TPDU;
	}

	/**
	 * Construct server ISOChannel
	 *
	 * @param p    an ISOPackager
	 * @param TPDU an optional raw header (i.e. TPDU)
	 * @throws IOException
	 * @see ISOPackager
	 */
	public BCDChannel(ISOPackager p, byte[] TPDU) throws IOException {
		super(p);
		this.header = TPDU;
	}

	/**
	 * constructs server ISOChannel associated with a Server Socket
	 *
	 * @param p            an ISOPackager
	 * @param TPDU         an optional raw header (i.e. TPDU)
	 * @param serverSocket where to accept a connection
	 * @throws IOException
	 * @see ISOPackager
	 */
	public BCDChannel(ISOPackager p, byte[] TPDU, ServerSocket serverSocket)
			throws IOException {
		super(p, serverSocket);
		this.header = TPDU;
	}

	protected void sendMessageLength(int len) throws IOException {
		try {
			serverOut.write(
					ISOUtil.str2bcd(
							ISOUtil.zeropad(Integer.toString(len), 4), true
					)
			);
		} catch (ISOException e) {
			Logger.log(new LogEvent(this, "send-message-length", e));
		}
	}

	protected int getMessageLength() throws IOException, ISOException {
		byte[] b = new byte[2];
		serverIn.readFully(b, 0, 2);
		return Integer.parseInt(
				ISOUtil.bcd2str(b, 0, 4, true)
		);
	}

	protected void sendMessageHeader(ISOMsg m, int len) throws IOException {
		byte[] h = m.getHeader();
		if (h != null) {
			if (h.length == 5) {
				// swap src/dest address
				byte[] tmp = new byte[2];
				System.arraycopy(h, 1, tmp, 0, 2);
				System.arraycopy(h, 3, h, 1, 2);
				System.arraycopy(tmp, 0, h, 3, 2);
			}
		} else
			h = header;
		if (h != null)
			serverOut.write(h);
	}

	/**
	 * New QSP compatible signature (see QSP's ConfigChannel)
	 *
	 * @param header String as seen by QSP
	 */
	public void setHeader(String header) {
		super.setHeader(ISOUtil.str2bcd(header, false));
	}
}

